使用光学调制孔径的实时太赫兹叠层成像术
Real-time THz ptychography using an optically modulated aperture
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中文总结 AI 辅助
研究针对叠层成像术成像速度和应用范围受限问题，提出光学调制孔径叠层成像术，用硅光调制器作可重构孔径，经实验验证能实时成像，复用策略提高性能，实现动态样本高通量成像，可用于无损评估和生物医学成像等。
中文摘要 AI 辅助
叠层成像术能让普通相机进行定量相位和强度成像。但对物体与探测器相对运动的要求以及高测量次数显著限制了成像速度和应用范围。本文介绍了光学调制孔径叠层成像术，用硅光调制器作为可快速重构的孔径，可用于微波、毫米波和太赫兹波段。实验证明在约0.1太赫兹能实时捕获叠层成像图像且无需移动部件。此外可重构孔径便于多样和空间复用探测。采用复用已知探测器重建策略提高了信噪比并增加每次测量的信息含量，能以16帧每秒捕获流体动力学图像。该光学调制方法实现了动态样本的高通量叠层成像，可用于无损评估和体内生物医学成像等应用。
英文摘要
Ptychography allows ordinary cameras to perform both quantitative phase and intensity imaging. However, the requirement for relative object to probe motion and high measurement count significantly limits imaging speed and application scope. In this work, we introduce optically modulated aperture ptychography, using a silicon photomodulator as a rapidly reconfigurable aperture, deployable across the microwave, millimeter wave and terahertz bands. We demonstrate experimentally at ~ 0.1 THz real-time ptychographic image capture, without moving parts. Furthermore, a reconfigurable aperture facilitates diverse and spatially multiplexed probes. We use a multiplexed known-probe reconstruction strategy that improves signal-to-noise ratio and increases the information content per measurement, enabling the capture of fluid dynamics at 16 fps. Our optical modulation approach enables high-throughput ptychographic imaging of dynamic samples, for applications such as non-destructive evaluation and in-vivo biomedical imaging.
